Contact Number and Toll Free Number ( its not toll free You need to pay standard call charges)
Call 400 from your Airtel number for complaints
Call 8800012121 from any other mobile or fixed line .
Email Support :-
Web Help Link :-
www.airtel.in/forme/home/needhelp for your query, request, complaint or feedback.
If not satisfied with email@example.com then you can mail at level two support email id
Office Addresses :-
Airtel Payments Bank Limited
1 Nelson Mandela Road,
Vasant Kunj, Phase II,
New Delhi – 110 070, India
airtel Center, Plot No. 16,
6th floor, Udyog Vihar, Ph-4,